Maybe you should speak to your social work advisor; they should be able to point you in the right direction of what would be expected of you when you apply. Also, they should know of what writing services are available on campus.
In terms of your personal statement itself, you should address what the question(s) are asking of you, but you can do so in a way that projects your own personality and experience. Given that you've been out of school for some time, you should definitely highlight how you have personally grown and matured while out of school and on the field. Schools are interested in your progression, as well as what you hope to bring to the school and to the field in the future. Think of your progression on the field thus far, and your goals-- you certainly throw in some anecdotes that you feel will exemplify this. Speaking to your advisor will help you with this, as well.